Improved process for bleaching fibrous materials



UNITED STATES PATENT OEEIGE.

HORATIO ANDERSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO IIIMSELF AND GEO.IV. CUSHING, OF SAME PLACE.

IMPROVEMENT IN STEAM-GENERATOR SAFETY-VALVES.

Specification forming part of Letters Patent No. 58,934, (lated October16, 18Go.

Fig. 2, a partial section ot the valve and connected parts thereof; Fig.3, an inside view ot' flange for containing valve-seat and attaching toboiler.

Similar letters of reference indicate like parts.

rlhis invention is designed to furnish a safety-valve to be attached tolocomotive, marine, or stationary boilers for preventing explosions byan excessive pressure 'ot' steam. It is adlinstable to whatever pressureis deemed safe,

and is secured to the inside of the dome or boiler in such manner thatit cannot be altered or tampered with by an engineer or any otherperson, and will always act promptly in discharging au excess of steam,if it should rise above the point ot' safety.

A is a iiange to be bolted and packed steamtight upon the dome or shellof a boiler, in the center of which is litted the valve-seat a. bis astand or bearing on the inside of the flange A, which supports thecapsular spring c, and through which passes the valvestem d. B is thevalve-a circular plate or beveled disk fitted to the seat a upon theoutside of the ilange A.

The stem tl screws into the hub c ot1 the valve B, and on the hub orboss e are guides ffff in the valve-scat a. Around the stem d andsupported on the stand b is wound the capsular spring c, which issecured to the stem by the washer g and the jam-nuts h` hf'.

The tension of the spring is regulated,aceordin g to the requiredpressure of steam, by setting up the jam-nuts h It', and when set thevalve is fastened to the inside ot' the boiler, secure against anyinterference with it by the engineer or other parties.

When the steam rises above the degree ot' pressure allowed, it forces upthe valve by the contraction of the spring c and escapes, thus aliordinga compact, durable, and reliable safety-valve.

Having described the construction and operation ot' my invention, what Iclaim as new, and desire to secure by Letters Patent, is-

1. The capsular spring c, combined with the valve B, the valvestem d,and the iam-nuts h It', constructed and arranged as and for the purposesherein described.

2. The tlangeA and stand b, combined with the valve B, and the capsularspring c, constructed and arranged as and for the purposes hereinspecified.

IIORATIO ANDERSON.

Witnesses:

WM. E. BEST, 'WILLIAM MCBRIDF.

